Heat and Work Introduction

Thermodynamics is all about transfer of energy in the system of heat and mechanical work. It is not unknown to us that energy can neither be created nor be destroyed. It can only be conserved. Heat and work are energies for conversion. The internal energy is considered to be as the only storage energy. However, in thermodynamics, we deal with change in energy than total energy. Therefore any random state can be consigned as the zero level of energy.